One thing you have to remember about guys like Belmo and Svennson is that they're bowling on Tour conditions. Obviously, some of those patterns are short and/or light on oil, but most of them give them a decent amount in the middle to push through. That's probably far different than what you're getting on league night.
The key is to change your rotation. My guess is that you are still coming around the side of the ball when trying to pick up the 10 pin. When you come around the side, any ball is capable of changing direction. What you want to do is practice coming up the back of the ball and making it roll more end over end toward the 10-pin. If you're not used to doing that, it's going to take time to get comfortable just like everything else, but once you get used to it, you'll find yourself far more successful.